Quick questions on Solubility product Ksp explained: HSC Chemistry Module 5

6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is the ionic product Q?

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For any solution (not necessarily at equilibrium), the same expression evaluated using current concentrations is the ionic product Q.

What is the common ion effect?

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Adding a common ion to a saturated solution decreases solubility. For example, adding NaCl to a saturated solution of AgCl increases

[Cl^-]

, so

[Ag^+]

must decrease to keep

Q = K_{sp}

. Some AgCl precipitates.

What is check the approximation?

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s' / 0.10 = 1.8 \times 10^{-8}

, far below 5%. Valid.

What is q1?

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Write the Ksp expression for silver chromate,

Ag_2CrO_{4(s)} \rightleftharpoons 2Ag^+_{(aq)} + CrO_4^{2-}_{(aq)}

, and state the units. [2 marks]

What is q2?

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The Ksp of

PbI_2

7.1 \times 10^{-9}

. Calculate the molar solubility of

PbI_2

in pure water. [3 marks]

What is q3?

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A solution contains

[Ba^{2+}] = 1.0 \times 10^{-4}

mol L

^{-1}

and

[SO_4^{2-}] = 5.0 \times 10^{-5}

mol L

^{-1}

. Given that

K_{sp}(BaSO_4) = 1.1 \times 10^{-10}

, (a) calculate

Q

, (b) predict whether a precipitate forms, (c) explain how adding sodium sulfate would change the answer. [2+1+2 marks]

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